Origin of Infrared Light Modulation in Reflectance-Mode Photoplethysmography.
We recently pointed out the important role of dermis deformation by pulsating arterial pressure in the formation of a photoplethysmographic signal at green light.The aim of this study was to explore the role of this novel finding in near-infrared (NIR) light.A light-emitting diode (LED)-based imaging photoplethysmography (IPPG) system was used to d